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DSM - Safe Handling of UV-Curable Materials - …

DSM Handling of UV-Curable Materials UV-Curable Technology1 Storage of UV-Curable Materials2 Transfer and Handling3 Safe Use of CuringEquipment4 Spray Application4 Toxicity5 Exposure Control6 Clean-Up7 Disposaland Maintenance8 Fire Fighting9 First Aid9 DSM Desotechis a leadingdeveloper of high-performanceUV- curable Materials for a variety of today s top products include DeSolite coatings and adhesives,Cablelite inks and matrixmaterials, and DSM Somos solid imaging Materials .

UV-Curable Technology 1 Storage of UV-Curable Materials 2 Transfer and Handling 3 Safe Use of Curing Equipment 4 Spray Application 4 Toxicity 5 Exposure Control 6

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  Applications, Material, Curing, Curable, Of uv curable materials

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Transcription of DSM - Safe Handling of UV-Curable Materials - …

1 DSM Handling of UV-Curable Materials UV-Curable Technology1 Storage of UV-Curable Materials2 Transfer and Handling3 Safe Use of CuringEquipment4 Spray Application4 Toxicity5 Exposure Control6 Clean-Up7 Disposaland Maintenance8 Fire Fighting9 First Aid9 DSM Desotechis a leadingdeveloper of high-performanceUV- curable Materials for a variety of today s top products include DeSolite coatings and adhesives,Cablelite inks and matrixmaterials, and DSM Somos solid imaging Materials .

2 Formulated differently thanconventional Materials , UV-Curable products requireparticular instruction for theirsafe Handling . The informationprovided in this guide is de-signed to acquaint you withUV-cure technology, identify its potential hazards, and provide direction and guide-lines for the safe applicationand efficient use of DSMD esotech UV-Curable products. By following the precautionsoutlined in this guide, in combination with the instruc-tions provided on our productlabels and material Safety Data Sheets, DSM DesotechUV- curable products can besafely handled in most TechnologyConventional coatings are generallydissolved in organic solvents or dis-persed in water. curing (or harden-ing) then proceeds by solvent evapo-ration and/or a chemical reaction. In the case of UV-Curable coatings,the curing reaction is initiated byexposure to intense ultraviolet light source which emits energyhaving a wave length of 200-400nanometers is used to activate a photoinitiator contained in the prod-uct.

3 This begins the polymerization,or curing , process which is completed in a few seconds or less. In general, UV-Curable Materials require lessenergy, less time to cure and containless volatile Materials than conven-tional products. Typical components of DSMD esotech s UV-Curable products mayinclude: a reactive resin, a multifunc-tional crosslinker, a reactive diluentand, in some cases, a solvent (or solvents) to aid in application. Depending upon end-use and application, these components maybe formulated with photoinitiators, stabilizers, pigments and other additives. The following general categories best describe the chem-istry used in our UV-Curable materialsare cured by a free radical mecha-nism and utilize oligomers and multifunctional and monomeric reactive diluents. Vinyl monomers,acrylated epoxies and urethanes areoften included for hardness, tough-ness, and good physical are polymerizedcationically by the photolysis of an initiator.

4 Hydroxyl-containing interme-diates are also commonly included inthese systems as free radical initiated UV sys-tems which cure primarily in the areas of direct light exposure, the cation-ically initiated epoxy systems will continue reacting after the UV sourceis removed and do not depend on thegeneration of free of UV-Curable MaterialsUV- curable Materials are composed ofreactive monomers and oligomers. Ifimproperly stored, these compositionsmay undergo polymerization with theevolution of heat.

5 Improperly storedUV Materials increase in viscosity andeventually result in a gelled (polymer-ized) product in the storage container. For this reason, products shouldalways be stored according to storageand Handling recommendations, aswell as applicable fire department andinsurance DSM Desotech products aresupplied in lined (baked phenolic)steel, plastic or fiber containers withplastic linings or inserts. Polyethylenebottles or liners are acceptable aslong as they are opaque to ultravioletlight and not used to hold solvent-containing products containing acry-lates should not be allowed to come incontact with iron, copper or copper-containing alloys to insure productstability. Plastic containers made fromorganic soluble Materials such aspolystyrene or polyvinyl-chloride(PVC) should not be used for lids should be tightly sealedin order to protect UVproducts fromcontamination and/or stray light whennot in use.

6 Also, a tightly sealed con-tainer will prevent product spillage ifthe container is accidentally droppedduring Handling . Shelf LifeMost DSM Desotech products areusable for at least six months from thedate they are shipped. Provisionsshould be made to insure inventoryrotation: first in, first used. In general, UV-Curable products areusable for periods up to one year oreven longer. DSM Desotech productsare marked with a retest date on thelabel. This date is determinedthrough the use of retain program andindicates when the product should bechecked by Desotech prior to its UV-Curable Materials should beshielded from sunlight or othersources of actinic radiation such asfluorescent or mercury vapor to actinic radiation will leadto increased product viscosity andeventually to product polymerization. TemperatureContainers or bulk storage tanks containing UV Materials should bekept indoors at temperatures between15 C (59 F) and 30 C (86 F).

7 Temp-eratures above 30 C will acceleratethe depletion of the stabilizers contained in the product. Once the stabilizers are exhausted, polymerization will occur. For pigmented Materials , elevatedtemperatures will increase the rate of pigment settling. Refer to specificdata sheets for individual products. Temperatures below 15 C may lead to phase separation (individual components separating from solution)or possible precipitation of stabilizers. If the product is believed to havebeen below 15 C for a prolongedperiod of time, it should be checkedfor performance before being used in production. Product that has undergone phaseseparation can be fully restored to initial properties by gently warmingand mixing the contents of the container. Care should be taken not to induce bubbles into the material during radical sources, such as peroxides and iron contaminants, can initiate polymerization of acrylatebased products.

8 Epoxy based prod-ucts will undergo rapid polymerizationwhen contaminated with strong acids. Introduction of free radical scavengers(phenolic compounds and others) willretard the cure rate of acrylate basedproducts. Alkali or amine contamina-tion will retard the cure rate of epoxybased products. Accidental contami-nation with polymerization inhibitorswill result in slower cure speed. It is also important to prevent acci-dental product contamination withorganic solvents or water. Dilution ofUV- curable products with non-reactive solvents will result in slower curespeed, if they are not first of polymerization includebulging or leaking containers, or theemission of heat or unusual odor fromthe container. The following stepsshould be followed if polymerization is suspected (particularly in the caseof drums or other large containers):First, all unnecessary personnelshould be evacuated from the input, if utilized, should be dis-continued and cooling initiated imme-diately through internal coils, externalheat exchangers or cold water spray.

9 If polymerization of an acrylate-basedproduct continues, as evidenced by a continued increase in temperature,one part of a solution of 15%Phenothiazine dissolved in GlycolEther DB Acetate (Diethyleneglycol n-butyl ether acetate) should beadded to 10 parts material and mixedthoroughly with air sparging and/ormechanical agitators or diaphragmtype pumps. Inhibitor solution shouldbe kept on hand for emergency should be in compliance withlocal Premature polymerization of a cationically curable material can be quenched by adding 5 parts of a 1/1 isopro-panol/water solution to 100 parts of coating. Add the solutionwith vigorous stirring to insure com-plete quenching of and HandlingThe manner in which UV-curablematerials are transferred from ship-ping container to application equip-ment will depend on many factorsincluding: volume of usage, containersize and type of coating equipment.

10 Consult DSM Desotech on the designof an appropriate transfer system tosuit specific needs. The following fundamental considerations must betaken into account in designing a successful material transfer of Transfer EquipmentAll transfer lines, hoses and fittingsshould be made of a material which isopaque, essentially non-reactive, andnot affected by UV-Curable material (such as stainless steel). Some plas-tics, such as polyethylene or Teflon ,may also be used as long as they arenot affected by the UV material andare opaque to ultraviolet light. Other-wise, curing may take place in thetubing with some ultraviolet systems. Avoid any alloys containing copper or iron, which may result in prematurecuring (polymerization) and and Pressurized AirIt is generally advisable to avoid highshear pumps such as gear or pistontypes because the high degree ofshear may cause the coating to cureand the pump to seize.


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